Guru Guide To Sql Server Architecture And Internals.pdf Info

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Alex captured the actual execution plan for the slow query. It showed a on a 50-million-row Orders table. The index was there. Why wasn’t it used? Guru Guide To Sql Server Architecture And Internals.pdf

The guide teaches you to use OPTION (RECOMPILE) , OPTION (OPTIMIZE FOR UNKNOWN) , or dynamic SQL with sp_executesql . [] (Hypothetical Link) Alex captured the actual execution

SELECT name, log_reuse_wait_desc FROM sys.databases WHERE name = 'SalesDB'; OPTION (OPTIMIZE FOR UNKNOWN)

The transaction log is a circular log. It can’t reuse space if any active transaction holds onto a VLFL (virtual log file) even if it’s old.